Fireproofing for aircraft



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u PPLICATIONIFILED MAR. 22, |918. .1,321,708 Patented Nov. 11, 1919.

'F:|.Z. Z /Algz'nio Acid Products j v eZZuZose Acetate FABER RICHARDSONBRADLEY, 0F EAST ORANGE, NEW JERSEY, ASSIGNOR T0 AIBRAFT FIREPROOFINGCORPORATION, 0F

PORATION' OF DELAWARE.

Application med March 22,

To all whom z'tlmay concern:

Be it known that I, PARKER R. BRADLEY, a citizen of the United States,and a resident of East Orange, in the county of Essex and State of NewJersey, have invented a new and Improved Fireproofing for Aircraft, ofwhich the following is a full, clear, and exact description. v Thisinvention relates to the fireproofing of the .cloth and wooden parts offlying machines by the application of a varnish-like liquid whichimparts a fire-resisting surface thereto, the fireprooing coating beingmade of alginic acid products or an algmate kas a li'wgeneral object ofthe invention is to provide a iireproof coating'which is comparativelyinexpensive, capable of being easily applied, and which has exceedinglyhigh fire-resisting qualities.

In carrying out the invention algin cellulose or the liber-like productobtained as a by-product in the extraction of algiuic acid may be groundinto a fine powder and then mixed with the alginic acid products or thealginates.

Preferably a layer of cellulose acetate dope in one or more coatings isapplied to the cloth or wood surface of the aircraft, and when dry alayerof one or more coatings of alginic acid or its alginates isapplied, using preferably those which dry to. a film insoluble` inwater. If desired, however, these layers may be reversed so that thecellulose acetate dope will be on the outside and the coating of thealginic acid products or alginates will be directly on the cloth or woodsurface. These alginic acid products may have their fire-resistingqualities increased by adding to them when in a.

Aliquid state a suitable substance, such asboric acid or the saltsgenerally used for vfireprooting purposes, such as ammonium `phosphate,s diuln tunostate a d the like.

Instea of using one or more hrst coatings of cellulose acetate dope,good results can be obtained by using one or more coatings of cellulosenitrate dope and theieafter the alginic acid coatings are applied asdescribed. The coatings of cellulose acetate or cellulose nitrate may beomitted and the coatings of alginic acid products or alginetes may beapplied directly tothe cloth sur- Specification of Letters Patent.

NUTLEY, NEW JERSEY, A C03 Patented Nv.1111919. i918. serial No. 224,076.

`faces of the aircraft, and the desired drumlike effects may beincreased or diminished by adding shellac or similar gum to theV alginicacid products or the alginates, thereby effecting an enormous saving inthe cost.y Or another method consists in applying successive layers ofcellulose nitrate dope and cellulose acetate dope, the layers being applied in coatings successively after each dries, and then finally one ormore layers of the ireprooing alginic acidproductswor thegiginaissan-ayjbsappiu` w Inthe'drawings, Figures l to 5 inclusive arefragmentary views showing the different. methods of coating the part ofan airship to be protected.`

In the figures 1 is supposed to represent 70 a part of an airship thatis to be fireproofed. Y In Fig. l only a single layer 2 of severalVcoatings is represented, which is a varnish-2 like liquid that hardensin a, film form and it is made from an alginic acid product or analginate'; Y

In Fig. 2 a double layer of protective material each of one or morecoats is shown.

" In Fig. 3 between the part l and the outer 85 layer 2 is a layer ofcellulose nitrate 4.

In KFig. 4 the arrangement of the coatings 2 and 3, as shown in Fig. 2,is reversed.

In Fig. A5 the layers 5 and 6 are respectively coatings of cellulosenitrate and cellulose acetate andthe outer layer 7 is composed ofcoatings of alginic acid products or aliginates.

The foregoing are some of the various methods of protecting the surfacesof the `infiammable parts of an aircraft, but other combinations oflayers may be employed, but an essential feature is the use of a.fireproong material embodying alginic acid.

Having thus described my invention, I claim as ne7 and desire to secureby Letters Patent:

1. The, combinatifn of a part to be fireproofed, with a surface layerthereon of a ireproofed material containing alginic acid products. l

2. The combination of a. part of en airl y .pas o SCE i A .lY

craft to bc fircproofed, with a plurality of layers of protectivccompound, one of the layers containing alginic acid products.

3. The combination of a part of an aircraft to be fireproofed, with aplurality of i layers of protective compound, one of the layerscontaining alginic acid products, and another layer Ycontaining acellulose compound.

4. The combination of a part of an aircraft to be fireproofed, with aireprooing covering including ailmforming varnishlike materialcontaining an alginic acid product.

A protective material for the clo th or wooden parts of an aircraft,contammg alginic acid products.

' 6. The combination of a part to be fireproofed, of a layer containinga cellulose compound and a second layer disposed over `the rst layer andcontaining alginic acid products. y

v'i'. The combination of a part to be fireproofed, of a plurality oflayers of protective compound, one of the layers containing insolublealginic acid products.

PARKER RICHARDSON BRADLEY,

